TM 9-2320-363-20-1Display: 5 Flashing LightsType: Deflate TrendSystem ModeConditionPossible Causes*Inflate onlyImproper deflate sequencePlugged or restricted Pneumatic Control Unit (PCU) vent lineFaulty PCU relief valvePoor ground connection to pressure transducerContaminated PCUFaulty PCU*Possible causes are listed in order of likely occurrence.Code DescriptionA "Deflate Trend" code displays when the systemhas determined that a deflate sequence is notfunctioning correctly. This is the result of either apressure increase during a deflation, or the systemfailing to lower the tires even a small amount of thedesired pressure drop.3-92.26 Change 3